Previously, and mainly due to application compatibility. ASLR has not been as effective as it has been expected. Nowadays, once some of the problems to fully deploy ASLR has been solved, it has become the key mitigation preventing reliable exploitation of software vulnerabilities. Defeating ASLR is a hot topic in the exploitation world.
During this talk, it will be presented why other mitigations without ASLR are not strong ones and why if you defeat ASLR you mainly defeat the rest of them. Methods to defeat ASLR had been fixed lately and the current way for this is using information leak vulnerabilities.